1) A person of exceptional intellect and creativity. 2) A person with an IQ score of at least 140. 3) A special talent or skill, or someone with such an ability. 4) In Roman mythology, a spiritual being or tutelary deity that can have a strong influence over others, much like the jinni in Islamic folklore.

Maybe George W. Bush is secretly a genius, but he's only pretending to be an idiot.

Some qoutes I'd like to share (by that, I mean a pasted them from another site)

To do easily what is difficult for others is the mark of talent. To do what is impossible for talent is the mark of genius.
* Henri-Frédéric Amiel

Geniuses are the luckiest of mortals because what they must do is the same as what they most want to do.
* W. H. Auden

Since when was genius found respectable?
* Elizabeth Barrett Browning

Few people can see genius in someone who has offended them.
* Robertson Davies

Genius always finds itself a century too early.
* Ralph Waldo Emerson

In every work of genius we recognize our own rejected thoughts: they come back to us with a certain alienated majesty.
* Ralph Waldo Emerson

Genius goes around the world in its youth incessantly apologizing for having large feet. What wonder that later in life it should be inclined to raise those feet too swiftly to fools and bores.
* F. Scott Fitzgerald

The world is always ready to receive talent with open arms. Very often it does not know what to do with genius.
* Oliver Wendell Holmes

Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.
* Georg Christoph Lichtenberg

Genius does what it must, and Talent does what it can.
* Owen Meredith

Better beware of notions like genius and inspiration; they are a sort of magic wand and should be used sparingly by anybody who wants to see things clearly.
* José Ortega y Gasset

Every positive value has its price in negative terms...The genius of Einstein leads to Hiroshima.
* Pablo Picasso

One science only will one genius fit:
So vast is art, so narrow human wit.
* Alexander Pope

We should like to have some towering geniuses, to reveal us to ourselves in colour and fire, but of course they would have to fit into the pattern of our society and be able to take orders from sound administrative types.
* J.B. Priestley

When a true genius appears in the world, you may know him by this sign, that the dunces are all in confederacy against him.
* Jonathan Swift

I put all my genius into my life; I put only my talent into my works.
* Oscar Wilde

Masterpieces are not single and solitary births; they are the outcome of many years of thinking in common, of thinking by the body of the people, so that the experience of the mass is behind the single voice.
* Virginia Woolf